Purification and identification of novel xanthine oxidase inhibitory peptides derived from round scad (Decapterus maruadsi) protein hydrolysates
Affiliation
Chinese Academy of Fishery SciencesJiangsu Ocean University
Shanghai Ocean University
University of Bedfordshire
Collaborative Innovation Center of Provincial and Ministerial Co-Construction for Marine Food Deep Processing
Issue Date
2021-09-24Subjects
round scad (Decapterus maruadsi)hydrolysis
peptides
xanthine oxidase inhibitory
purification
identification
Subject Categories::C161 Marine Biology
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The objective of the present study was to investigate the xanthine oxidase (XO) inhibitory effects of peptides purified and identified from round scad (Decapterus maruadsi) hydrolysates (RSHs). In this study, RSHs were obtained by using three proteases (neutrase, protamex and alcalase). Among them, the RSHs of 6-h hydrolysis by neutrase displayed the strongest XO inhibitory activity and had an abundance of small peptides (<500 Da). Four novel peptides were purified by immobilized metal affinity chromatography and identified by nano-high-performance liquid chromatography mass/mass spectrometry. Their amino acid sequences were KGFP (447.53 Da), FPSV (448.51 Da), FPFP (506.59 Da) and WPDGR (629.66 Da), respectively. Then the peptides were synthesized to evaluate their XO inhibitory activity. The results indicated that the peptides of both FPSV (5 mM) and FPFP (5 mM) exhibited higher XO inhibitory activity (22.61 +- 1.81% and 20.09 +- 2.41% respectively). Fluorescence spectra assay demonstrated that the fluorescence quenching mechanism of XO by these inhibitors (FPSV and FPFP) was a static quenching procedure. The study of inhibition kinetics suggested that the inhibition of both FPSV and FPFP was reversible, and the type of their inhibition was a mixed one. Molecular docking revealed the importance of π-π stacking between Phe residue (contained in peptides) and Phe914 (contained in the XO) in the XO inhibitory activity of the peptides.Citation
Hu X, Ya Z, Zhou S, Chen S, Wu Y, Li L, Yang X (2021) 'Purification and identification of novel xanthine oxidase inhibitory peptides derived from round scad (Decapterus maruadsi) protein hydrolysates ', Marine Drugs, 19 (10), 538.Publisher
MDPIJournal
Marine DrugsAdditional Links
https://www.mdpi.com/1660-3397/19/10/538/htmlType
ArticleLanguage
enISSN
1660-3397ae974a485f413a2113503eed53cd6c53
10.3390/md19100538
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